CLEVELAND, Ohio-- The Food and Drug Administration (FDA) is warning consumers not to use six different weight loss supplements because they contain a dangerous drug that was pulled from the market in 2010 because of the risk of heart attack and stroke. The supplements contains sibutramine, marketed under the brand name Meridia as a weight loss drug before its withdrawal.

The tainted supplements are:

Mix Fruit Slimming, capsules sold on Amazon and other online retailers that are advertised as a "100% natural herbal new slimming pill without any side effects." The pills also contain phenolphthalein, a laxative ingredient the FDA banned in the 1990's because it is potentially carcinogenic.

Lingzhi Cleansed Slim Tea, also sold on Amazon and other online retailers, is advertised to "help to improve the function of intestines and stomach and speed up metabolism."

Trim Fast, available online and possibly in some retail stores, advertised to "suppress appetite, increase your metabolism by up to 18 times, and significantly increase energy."

Lipo 8 is also sold online and in some retail stores as a weight loss pill made from white kidney bean extract to "help eliminate fat before it gets absorbed into the body."

FDA analysis confirmed the presence of the drugs in each supplement. The agency has discovered sibutramine in more than 50 weight loss supplements since January of 2013, including capsules, powders and slimming coffee or tea drinks.

Sibutramine, marketed as Meridia in the U.S. until it was removed from the market in 2010, has the potential to interact with other prescription medications and poses a particular risk for people with heart conditions. In a clinical trial called SCOUT, the drug increased the risk of major adverse cardiovascular events (composite of non-fatal heart attack, non-fatal stroke, resuscitation after cardiac arrest and cardiovascular death) by 16 percent in patients treated with Meridia compared to patients taking a placebo.

Phenolphthalein, the hidden ingredient in Mix Fruit Slimming, was the active ingredient in popular laxatives such as Ex-Lax before the mid 1990's. It was reclassified by the FDA in 1997 as "not generally recognized as safe" after animal studies showed an increased risk of cancer after exposure to the chemical, and laxatives using it were withdrawn from the market.

The FDA notes that there is a growing trend of dietary supplements and weight loss products containing unadvertised drugs and chemicals. For a full list of FDA's warning notices, visit its public notification page.

If you've taken a dietary or weight loss supplement and experienced a side effect or adverse event, contact your doctor and report it to the FDA's MedWatch Safety Information and Adverse Event Reporting Program by completing a form online or by calling 1-800-332-1088 to request a form.

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